Despite not being a personal trainer herself, the recently turned 22 year old is using her face and body to help promote exercise along with app, Rig fitness.

Alex Beattie's ex particularly focuses on her bottom when training in the gym [Montana Brown/Instagram]

Montana Brown has filmed a series of professional videos for the fitness app [Montana Brown/Instagram]

After seven weeks in her bikini on Love Island, Montana’s bum and abs become a national hit and now it’s time for her to share her top tips with her fans.

Confirmed as their ambassador on Instagram, the reality star has since been showing off fitness videos, in particular to do with how to get a fit bum.

In her latest clip, Montana wrote: “Happy Bank Holiday everyone!! It's definitely worth incorporating the sled push into your gym routines for glute activation, get the booty popping, and to add it makes you look hard as nails.

“Little tip, try and keep your back straight and focus on clenching the. Let's get motivated ladies to get in shape because no one made a song about a girl with a small butt @box_creative_films @rig.fitness.”

The Love Island star showed off her famous body for seven weeks in a bikini on the show [Montana Brown/Instagram]

Montana Brown's figure was the talk of the Love Island villa [Montana Brown/Instagram]

So what is Rig fitness? A downloadable app, you become part of a fitness network that allows you to find local fitness classes, personal trainers and even training partners.

There are also recipes, workout routines – which is where Montana comes in – and a system to manage your fitness diary.